What a keen eye,yes, Equanimity is the missing trait in me.

In this birth, my nature is mercurial, I am taking enough austerities and disciplines to chain me down. Shameful I am for this behaviour!

Equanimity is what I should focus and develop. That's the weakness, I need to work on.  

I took a random page in Vishuddi-Magga and it also took me to nuances and development of Equanimity. 

Thanks for sharing Buddha's words, his words are indeed like water fed on a parched land!! Informative!